Vapor Fraction

Definition - What does Vapor Fraction mean?

Vapor fraction refers to the ratio quantity of the gaseous component present in a mixture of two or more physical states.

The higher temperatures of a metallic surface can propagate an increase in the vapor fraction of the metallic environment because more vapor is formed at higher temperatures. However, an increase in the vapor fraction correlates to an increase in pressure. This increases the likelihood of material fatigue, metal degradation and vapor corrosion.

Corrosionpedia explains Vapor Fraction

Vapor fraction is used to describe systems of vapor–liquid equilibrium (VLE) in the distribution of a chemical mixture between the gas phase and the liquid phase. Binary mixtures contain both gases and liquids. Therefore, the mole fractions of each phase can be used to describe the primary composition and state of the mixture relative to each component. The mole component of the vapor phase is called the vapor fraction.